From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Departmental memo discussing and comparing the stresses on standard and proposed valve springs.
| Identifier | ExFiles\Box 80\3\ scan0075 | |
| Date | 28th September 1911 | |
| R.R. 348a (100 H) (W 603. 27.6.11) E.{Mr Elliott - Chief Engineer} P. 9275. DEPARTMENTAL MEMO. REF. 38/18 (iii) Issued 28th Sept. 1911. This column is for Name of Person addressed. DATE. Re Valve Springs. Mr. Swetnam 28-9-11 Will you please let me know what are the stresses in the present spring, and what are the stresses in the spring you propose- (a) When the valve is on its seat. (b) When the valve is lifted by the cam. [Handwritten section below] Ref 38/18 (iii) ? Haden 29-9-11 OH [initials] (1) Standard spring is stressed 70000 when spring is compressed with valve full open (2) Standard spring is stressed 50000 when valve is on its seat Spring proposed. (1) Stressed to 62000 with valve full open (2) " " 50,000 " " on seat AH [Signature] This sheet must be filed with the correspondence to which it refers. | ||